Determining the Amount of Grams of N2 Produced

Oct 13, 2025 by wbrum.org 109 views

Understanding the Balanced Chemical Equation

The balanced chemical equation for the reaction between ammonia (NH3) and oxygen (O2) is given as:

${ 4 \text{NH}_3 + 3 \text{O}_2 \rightarrow 2 \text{N}_2 + 6 \text{H}_2\text{O} }$

This equation indicates that 4 moles of ammonia react with 3 moles of oxygen to produce 2 moles of nitrogen gas (N2) and 6 moles of water (H2O).

Calculating the Molar Mass of Nitrogen Gas (N2)

To determine the amount of grams of N2 produced, we need to calculate the molar mass of N2. The atomic mass of nitrogen (N) is approximately 14.01 g/mol. Since N2 is a diatomic molecule, its molar mass can be calculated as follows:

Molar mass of N2 = 2 x atomic mass of N = 2 x 14.01 g/mol = 28.02 g/mol

Determining the Amount of Grams of N2 Produced

Given that 4.03 moles of NH3 react, we can use the balanced chemical equation to determine the number of moles of N2 produced. According to the equation, 4 moles of NH3 produce 2 moles of N2. Therefore, the mole ratio of NH3 to N2 is 4:2 or 2:1.

Let's calculate the number of moles of N2 produced:

Number of moles of N2 = (2/4) x number of moles of NH3 = (2/4) x 4.03 moles = 2.015 moles

Now, we can calculate the mass of N2 produced using the molar mass of N2:

Mass of N2 = number of moles of N2 x molar mass of N2 = 2.015 moles x 28.02 g/mol = 56.43 g

Therefore, the amount of grams of N2 produced is approximately 56.43 g.

Conclusion

In this article, we used the balanced chemical equation to determine the amount of grams of N2 produced when 4.03 moles of NH3 react. We calculated the molar mass of N2 and used the mole ratio from the balanced equation to determine the number of moles of N2 produced. Finally, we calculated the mass of N2 produced using the molar mass of N2.

Key Takeaways

The balanced chemical equation is a crucial tool in chemistry for determining the mole ratio of reactants and products.
The molar mass of a substance can be calculated by multiplying the atomic mass of its constituent atoms by the number of atoms in the molecule.
The mole ratio from the balanced equation can be used to determine the number of moles of a product produced when a certain amount of a reactant reacts.

Frequently Asked Questions

Q: What is the balanced chemical equation for the reaction between ammonia and oxygen? A: The balanced chemical equation is given as: 4 NH3 + 3 O2 → 2 N2 + 6 H2O
Q: How do I calculate the molar mass of a substance? A: To calculate the molar mass of a substance, multiply the atomic mass of its constituent atoms by the number of atoms in the molecule.
Q: How do I determine the amount of grams of a product produced when a certain amount of a reactant reacts? A: Use the mole ratio from the balanced equation to determine the number of moles of the product produced, and then calculate the mass of the product using the molar mass of the product.
Balancing Chemical Equations and Calculating Molar Mass: Q&A ===========================================================

Q: What is the purpose of balancing a chemical equation?

A: The purpose of balancing a chemical equation is to ensure that the number of atoms of each element is the same on both the reactant and product sides of the equation. This is important because it allows us to determine the mole ratio of reactants and products, which is necessary for calculating the amount of a substance produced.

Q: How do I balance a chemical equation?

A: To balance a chemical equation, follow these steps:

Write the unbalanced equation.
Count the number of atoms of each element on both the reactant and product sides.
Add coefficients (numbers in front of the formulas of reactants or products) to balance the equation.
Check that the number of atoms of each element is the same on both sides.

Q: What is the difference between a mole and a gram?

A: A mole is a unit of measurement that represents 6.022 x 10^23 particles (atoms or molecules). A gram is a unit of mass that represents 1/1000 of a kilogram. To convert between moles and grams, you need to know the molar mass of a substance.

Q: How do I calculate the molar mass of a substance?

A: To calculate the molar mass of a substance, multiply the atomic mass of its constituent atoms by the number of atoms in the molecule.

Q: What is the mole ratio of reactants and products in a balanced chemical equation?

A: The mole ratio of reactants and products in a balanced chemical equation is the ratio of the number of moles of each reactant to the number of moles of each product.

Q: How do I determine the amount of a substance produced when a certain amount of a reactant reacts?

A: To determine the amount of a substance produced when a certain amount of a reactant reacts, follow these steps:

Write the balanced chemical equation.
Determine the mole ratio of reactants and products.
Calculate the number of moles of the product produced.
Calculate the mass of the product produced using the molar mass of the product.

Q: What is the difference between a limiting reactant and an excess reactant?

A: A limiting reactant is the reactant that is present in the smallest amount and determines the amount of product that can be formed. An excess reactant is the reactant that is present in excess of the amount needed to react with the limiting reactant.

Q: How do I determine the limiting reactant in a reaction?

A: To determine the limiting reactant in a reaction, follow these steps:

Write the balanced chemical equation.
Determine the mole ratio of reactants and products.
Calculate the number of moles of each reactant.
Compare the number of moles of each reactant to determine which one is the limiting reactant.

Q: What is the significance of the molar mass of a substance?

A: The molar mass of a substance is significant because it allows us to convert between moles and grams, which is necessary for calculating the amount of a substance produced.

Q: How do I calculate the molar mass of a substance from its atomic masses?

A: To calculate the molar mass of a substance from its atomic masses, multiply the atomic mass of each element by the number of atoms in the molecule and add the results together.

Q: What is the difference between a mole and a mole fraction?

A: A mole is a unit of measurement that represents 6.022 x 10^23 particles (atoms or molecules). A mole fraction is the ratio of the number of moles of a substance to the total number of moles of all substances in a mixture.

Q: How do I calculate the mole fraction of a substance in a mixture?

A: To calculate the mole fraction of a substance in a mixture, divide the number of moles of the substance by the total number of moles of all substances in the mixture.